From the following data determine Karl Pearson's coefficient of correlation between X and Y series for 15 pairs.

X SERIES :

Mean = 80

Sum of squares of deviation from A.M. = 56

Sum of product of deviations of X and Y from their respective Means = 92

Y SERIES :

Mean = 120

Sum of squares of deviation from A.M. = 156

Sum of product of deviations of X and Y from their respective Means = 92

So, there exists very high degree of correlation between the two variables X and Y

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